FERNS, FOSSILS AND FUEL 
SOME OF THE BOOKS USED FOR REFERENCE 
Bailey, L. H. Cyclopedia of American Horticulture. 
4 vols. Macmillan Co., New York City. 1909. 
Berry, E. W. Tree Ancestors . A glimpse into the past, 
pp. vi 270. 1 pi. 47 figs. Williams & Wilkins Co., 
Baltimore, Md. 1923. 
Berry, E. W. Paleobotany: A Sketch of the Origin and 
Evolution of Floras. From the Smithsonian report 
for 1918, pp. 289-409, with 6 plates. Washington, 
D. C. 1920. 
Chamberlin, T. C. and R. D. Salisbury. College Text¬ 
book of Geology. Part II: Historical Geology, 
New edition rewritten and revised by R. T. Chamber¬ 
lin and P. Mac Clintock. H. Holt & Co., New 
York. 1930. 
Crookall, R. Coal Measure Plants, pp. 80. 40 pis. 
Edward Arnold & Co., London. 1929. 
DeCandolle, Alphonse. Origin of Cultivated Plants. 
D. Appleton Co., New York. 1898. 
Knowlton, F. H. Plants of the Past. A popular account 
of fossil plants, pp. xix, 275. 90 illus. Princeton 
University Press, Princeton. 1927. 
Noe, A. C. Pennsylvanian Flora of Northern Illinois. 
pp. 113. 45 pis. Bull. 52, Illinois State Geological 
Survey, Urbana, Illinois. 1925. 
Wells, H. C. The evidence furnished by biochemistry 
and immunology on biologic evolution. Archives 
of Pathology, vol. 9, pp. 1044-1075, May, 1930. 
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